We have a loooooong curvy path from the house down to the driveway, with grass either side. Last Autumn I spent bloody ages using an edger tool to clear the grass spilling over onto the path. Honestly, it was miserable and my hands were covered in blisters.
Now, as the grass is growing, I can already see the grass spilling back onto the path. The mower can get right to the edge because the path is sunken in lower than the grass, so we almost need something that would block the grass spreading. Does that make sense?
What could we do? Considering the sheer length of the path, I can't think of anything that wouldn't require me selling a kidney to afford it.